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首页> 外文期刊>Plant and Soil >Histological observation of secondary aerenchyma formed immediately after flooding in Sesbania cannabina and S. rostrata
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Histological observation of secondary aerenchyma formed immediately after flooding in Sesbania cannabina and S. rostrata

机译：Sesbania cannabina和S. rostrata洪水后立即形成的继发性气肿的组织学观察

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摘要

The effect of up to 48 h of flooding on the development of roots of Sesbania cannabina an0d S. rostrata seedlings was examined in a pot experiment. Light microscopy revealed that the outermost cells of the phellogen of the taproot of S. cannabina expanded and elongated during the first 12 h of flooding. After 18 h, the outermost of these regions was composed of cells that had expanded radially direction to form a spongy zone inside the endodermis. These elongated cells were radially connected to each other and formed the secondary aerenchyma surrounding the stele of taproot. While those histological alterations were not observed in S. rostrata, the number of layers of cells originating in the pericycle increased slightly, but elongation of the cells was not found during the first 18 h of flooding. After 36 h of flooding, cell elongation was also detected as outer layers of the phellogen. The delayed response to flooding in aerenchyma production in S. rostrata was compensated by immediate development of adventitious roots on submerged parts of the hypocotyl.
机译：在盆栽试验中，研究了长达48 h的淹水对Sesbania cannabina and S. rostrata幼苗根系发育的影响。光学显微镜显示，在水淹的前12小时内，大麻链球菌主根的最上层细胞的细胞膨胀和伸长。 18小时后，这些区域的最外面是由沿径向扩展以形成内胚层内部海绵状区域的细胞组成的。这些细长的细胞彼此径向连接，并形成围绕主根茎的次生气孔。虽然在轮状葡萄球菌中未观察到这些组织学改变，但起源于周生周期的细胞层数略有增加，但在洪水的前18小时内未发现细胞伸长。水淹36小时后，细胞伸长也被检测为黄原的外层。锈病菌气生菌生产中对水淹的延迟响应被下胚轴淹没部分上不定根的立即发育所补偿。

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